What does it mean when a property is highlighted in green?
Green means a property has a keyframe applied, but not on the current frame. (yellow means the key is on the current frame). Your changes aren't sticking because it's reverting to the keyed values. You can set a new key if you'd like by right-clicking the field and hitting "insert keyframe", adjust the key values in the graph editor, or just clear them all by right-clicking the prop and hitting "clear keyframes"

Also, for the sake of completeness, a purple property is one that has a driver set.